Cold temperatures can take a toll on CV boots.  These rubber parts shield CV joints from dirt and moisture while keeping in the protective grease.  When that barrier is compromised, CV joint failure is inevitable if not caught immediately.  CV joint failure could cause the steering to lock, or the car to not move at all, and getting your vehicle back on the road will mean expensive repairs.  To ensure your CV joints are protected, ask for a quick check of your CV boots with your next service.